/*
 * Copyright (C) 2007 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.dx.rop.cst;

import com.android.dx.rop.type.Type;
import com.android.dx.util.Hex;

/**
 * Constants of type {@code CONSTANT_Float_info}.
 */
public final class CstFloat extends CstLiteral32 {

	/** {@code non-null;} instance representing {@code 0} */
	public static final CstFloat VALUE_0 = make(Float.floatToIntBits(0.0f));

	/** {@code non-null;} instance representing {@code 1} */
	public static final CstFloat VALUE_1 = make(Float.floatToIntBits(1.0f));

	/** {@code non-null;} instance representing {@code 2} */
	public static final CstFloat VALUE_2 = make(Float.floatToIntBits(2.0f));

	/**
	 * Makes an instance for the given value. This may (but does not
	 * necessarily) return an already-allocated instance.
	 * 
	 * @param bits
	 *            the {@code float} value as {@code int} bits
	 */
	public static CstFloat make(int bits) {
		/*
		 * Note: Javadoc notwithstanding, this implementation always allocates.
		 */
		return new CstFloat(bits);
	}

	/**
	 * Constructs an instance. This constructor is private; use {@link #make}.
	 * 
	 * @param bits
	 *            the {@code float} value as {@code int} bits
	 */
	private CstFloat(int bits) {
		super(bits);
	}

	/** {@inheritDoc} */
	@Override
	public String toString() {
		int bits = getIntBits();
		return "float{0x" + Hex.u4(bits) + " / " + Float.intBitsToFloat(bits)
				+ '}';
	}

	/** {@inheritDoc} */
	public Type getType() {
		return Type.FLOAT;
	}

	/** {@inheritDoc} */
	@Override
	public String typeName() {
		return "float";
	}

	/** {@inheritDoc} */
	public String toHuman() {
		return Float.toString(Float.intBitsToFloat(getIntBits()));
	}

	/**
	 * Gets the {@code float} value.
	 * 
	 * @return the value
	 */
	public float getValue() {
		return Float.intBitsToFloat(getIntBits());
	}
}
